Commercial and Industrial Hot Water
Gas and Diesel Driven, Oil Fired
OWNER’S MANUAL MODEL PK0702
Call 1-800-344-3371
Email service @qvtools.com
Website: www.qvtools.com
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Oil Fired Gas & Diesel • Rev. 4/7/2016
PowerKing Pressure Systems
1-800-344-3371
Read the following instructions carefully before attempting to assemble,
install, operate, or service this pressure washer. Failure to comply with these
instructions could result in personal injury and/or property damage.
Table of Contents
IMPORTANT SAFETY INFORMATION ............................................................................................................. 3
SPECIFICATIONS ............................................................................................................................................ 7
INTRODUCTION ............................................................................................................................................. 9
OPERATING INSTRUCTIONS ........................................................................................................................ 10
CHEMICAL APPLICATION ............................................................................................................................. 12
WINTER PUMP/ COIL PROTECTION ............................................................................................................ 13
GENERAL MAINTENANCE ............................................................................................................................ 13
MAINTENANCE CHECKLIST .......................................................................................................................... 15
GLOSSARY OF TERMS .................................................................................................................................. 17
COMPONENT IDENTIFICATION ................................................................................................................... 18
QUICK DIAGNOSTICS AND SOLUTIONS GUIDE ............................................................................................ 25
WIRING DIAGRAMS ..................................................................................................................................... 27
MANUFACTURER’S WARRANTY .................................................................................................................. 31
SERVICE MANUAL........................................................................................................................................ 32
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IMPORTANT SAFETY INFORMATION
The safe operation of our pressure washing systems is the FIRST priority of PowerKing. This
will only be achieved by following the operation and maintenance instructions as explained in
this manual and all other enclosed manuals.
This manual contains essential information regarding the safety hazards, operations, and
maintenance associated with this machine. The manual should always remain with the machine,
including if it is resold.
ALL CAUTIONS AND SAFETY WARNINGS MUST BE FOLLOWED TO AVOID
INJURY OR DAMAGE TO EQUIPMENT.
THIS EQUIPMENT IS TO BE USED ONLY BY TRAINED OPERATORS AND MUST
ALWAYS BE ATTENDED DURING OPERATION.
WARNING: To reduce the risk of injury,
read operating instructions carefully
before using.
WARNING: Use protective
eyewear and clothing when
operating equipment in
order to avoid personal
injuries.
1. Read the instructions in this manual carefully before attempting to assemble,
install, operate or service this pressure washer. Failure to comply with the
instructions could result in personal injury and/or property damage.
WARNING: This
machine exceeds
85db. Appropriate
ear protection must
be worn.
WARNING: Flammable
liquids can create fumes
which can ignite, causing
property damage or severe
injury.
WARNING: Risk of
explosion. Operate only
where open flame
or torch is permitted.
2. Be thoroughly familiar with all controls and know how to stop the machine in
the event of an emergency.
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.
WARNING: Risk of fire. Do not
add fuel when operating machine.
3. Never use gasoline, crankcase draining, or waste oil in your burner fuel
tank. Never run pump dry or let the pump run with the trigger gun released
for more than 2 minutes. The minimum clearance to any combustible material
is 12 inches.
WARNING: Keep water spray
away from electrical wiring.
4. All electrically powered equipment must be grounded at all times to prevent
fatal electric shots. Do not spray water on or near electrical components. Do
not touch electrical components while standing in water or when hands are
wet. Always make sure machine is disconnected from power source before
servicing.
WARNING: Risk of asphyxiation.
Use this product only in a well
ventilated area.
5. Use equipment in a well-ventilated area to avoid carbon monoxide poisoning
or death. This machine must never be connected to a Type B gas vent.
WARNING: Risk of injection or
severe injury to persons. Keep
clear of nozzle spray.
6. High pressure spray can cause serious injuries. Never point pressurized
spray at any person or animal. Handle the spray assembly with care.
WARNING: Risk of
injury. Hot surfaces
can cause burns.
WARNING: Hot discharge
fluid. Do not touch or
direct discharge stream
at persons.
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7. Hold firmly to the gun and wand during start up and operation of the
machine. Do not attempt to make adjustments while the trigger gun is in
operation.
8. Make sure all quick coupler fittings are properly secured before operating
pressure washer.
WARNING: Risk of injury
from falls when using ladder.
9. Do not overreach or stand on anything unstable. Keep a good balance and
make sure to keep a steady footing at all times.
WARNING: Protect from freezing.
WARNING: Trigger gun kicks
back. Hold with both hands.
10. It is important to keep your machine from freezing in order to keep it in its
best working condition. Failure to protect your machine from freezing may
cause damage to the machine and personal injuries may occur as a result.
11. For machines with a 12 V burner: Disconnect battery ground terminal
before servicing.
12. Protect high pressure hoses from sharp objects and vehicles. Inspect
condition of hoses prior to use, or serious injury could occur.
13. Do not pass acids or other caustic or abrasive fluids through the pump.
WARNING: Risk of Injury
RISK OF INJURY
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14. Never run pump dry of water or oil or or let the pump run with the trigger gun
released for more than 2 minutes.
15. Do not attempt to operate this machine if fatigued or under the influence of alcohol,
prescription medications, or drugs.
16. Some of the maintenance procedures involved in this machine require a certified
technician (these steps are indicated throughout this manual). Do not attempt to perform
these repairs if you are not qualified.
If you need further explanation of any of the information in this manual, suspend any
activity involving the equipment and call our toll free number for assistance,
1-800-344-3371.
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SPECIFICATIONS
Commercial Hot Water Gas - Oil Fired
MODEL
GPM
PSI
BURNER OIL
PRESSURE (PSI)
BTU
HP/ ENGINE
DRIVE
ELECTRIC
START
BURNER
EZO2703G
3
2700
130
300,000
6.5 KOHLER
DIRECT
NO
120V
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INTRODUCTION
Thank you for selecting a quality PowerKing product. We are pleased to have you included
among the many satisfied owners of PowerKing cleaning machines. Years of engineering
have gone into the development of these fine products and only top quality components and
materials are used throughout. Each machine is carefully tested and inspected before leaving
our plant to ensure years of dependable performance.
To continue to receive satisfactory performance, remembering that this machine represents a
substantial investment on your part, and if properly cared for and maintained it will return this
investment many times over. As with all mechanical equipment, your machine requires proper
operation and maintenance as outlined in this manual for maximum trouble free life.
This manual has been prepared under the direction of our engineering and service technicians.
Their experience in designing, manufacturing, installing and servicing our equipment from our
company’s inception is condensed in this manual. They know what information the end user
needs in order to get the optimum performance from their pressure washer. Please read
carefully.
This manual contains information that will be specific for your pressure washer, as well as
similar models.
Carefully review any additional manuals that have been included with your system and
follow ALL ADDITIONAL OPERATING INSTRUCTIONS AND SAFETY NOTICES.
They are specific for the quality components that have been used to manufacture your
machine and are an integral part of the operating and maintenance procedures.
The management & staff at PowerKing are proud of the equipment that we design and
manufacture and we thank you for making us your # 1 choice in pressure washers. If you
have any questions please do not hesitate to call us, 1-800-344-3371.
Our goal is that you will be satisfied with the performance, quality, and service you receive
from PowerKing and that if you need to replace this machine in years to come, you will give us
the opportunity to continue supplying equipment to your company.
PLEASE READ MANUALS CAREFULLY BEFORE USING MACHINE. EXAMINE
MACHINE AND CRATE CAREFULLY FOR SHIPPING DAMAGE OR MISSING
PARTS. REPORT PROMPTLY ANY SHORTAGES OR DAMAGE CLAIMS TO
FREIGHT CARRIER OR DEALER.
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OPERATING INSTRUCTIONS
1. Perform pre-start maintenance inspection on all applicable systems prior to operating the
machine. This is essential for the safe, effective and efficient operation. You will get optimum
performance from your system ONLY if these instructions and inspections are followed. Any
indication that the pressure washing system was not operated and maintained according to these
instructions may cancel the manufacturers’ warranty.
Location – Be sure to install in an area that has sufficient air ventilation to support combustion
of oil in burner.
Controls – Make sure all controls turned to the off position.
Pump – Oil level - Level the pressure washer. Be sure oil level in the pump is correct on dip
stick. If the level is low, add the correct oil to the proper level. USE ONLY SAE 30 W NON-
DETERGENT OIL OR HYDRAULIC 68. DO NOT OVER FILL.
Gas Engine - Gasoline level – The engine is a 4 cycle and uses regular octane, unleaded fuel.
DO NOT USE MIXED FUEL. Refer to the engine operation manual included with your
pressure-washing unit.
Gas Engine - Oil level – The engine is a 4 cycle and uses 10W30 detergent oil. Refer to
Glossary or engine manual.
Diesel Engine – Refer to engine operation manual included with your pressure washing unit for
oil and fuel recommendations.
Oil Fired Burner - Oil Tank Level – #2 Furnace oil is recommended for the burner oil tank, as
it burns cleaner and the burner requires less maintenance. Diesel fuel may be used as an
alternative. Do not overfill burner tank.
Visually inspect all electrical components to assure they are in good condition, showing
No signs of exposure, breakage or splicing.
Visually inspect all hoses, nozzles and guns to assure they are in good condition. If
replacements are necessary they must be rated to withstand the machines operating
pressure and temperatures.
2. Attach high-pressure hose to hot water outlet quick connector. Attach the other end of high
pressure hose (with quick coupler) to spray gun. Ensure that quick disconnect connections are
tightly locked together. Apply a sharp pull on hose to confirm they are secured.
Attach wand nozzle specific to task requirements (i.e. chemical or pressure wash).
[Quick Coupling Operation – Pull back sleeve end and insert male end into nozzle quick coupler,
release sleeve and confirm connection by pulling on the nozzle].
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3. Attach water source to water inlet located on pump. The water source must be attached with
a good quality standard garden type hose (1/2” minimum is required). Connect male fitting into
the female pump inlet fitting. Make sure that the inlet screen/filter is intact and fitted correctly.
Turn on water source. WATER MUST BE IN SUFFICIENT SUPPLY, AND PRESSURE
MUST BE BETWEEN 20 –60 PSI TO ENSURE PROPER AND SAFE OPERATION. Specific
attention should be given if using a well water supply. Ensure water is flowing from end nozzle
with the trigger gun pulled. Deplete system of all air.
4. Start Gas/Diesel Engine
Refer to instructions in engine manual. MAKE SURE THAT THE ENGINE EXHAUST IS NOT
FACING ANY FLAMMABLE MATERIALS. Adjust burner thermostat to desired temperature,
then turn BURNER switch to ‘ON’.
5. Burner operation
Be sure water is flowing through water heater coil before turning on BURNER switch. Turn
thermostat to desired temperature. Burner will ignite and remain in operation as long as there is
sufficient water flow to satisfy the pressure switch and temperature control.
IF YOU EXPERIENCE IGNITION FAILURE, DO NOT ATTEMPT TO RESTART
BURNER! EXCESS FUEL AND VAPORS MAY HAVE ACCUMULATED AND THE
CHAMBER MAY BE HOT. THE UNIT MUST COOL DOWN BEFORE RESTART CAN
BE ATTEMPTED.
Warning: Condensation on Coil
When cold water is being pumped through the heater coil and the burner is firing, condensation
may form at times on the coil and drip down into the burner compartment. This can be
particularly noticeable on cold, humid days giving the false appearance of a leaking coil. A
leaking coil or system will be evident if the pump keeps cycling with the trigger released. The
pump head pressure should read ‘0’.
Electrically Operated Burners – These models generate 12V from the gasoline engine and
provide the necessary power for the burner. IF YOU REQUIRE UPGRADES OR
MODIFICATIONS TO YOUR EXISTING ELECTRICAL SYSTEM IN ORDER TO
OPERATE YOUR PRESSURE WASHER, THEY MUST BE PERFORMED BY A LICENSED
ELECTRICIAN AND BE COMPLETED IN ACCORDANCE TO ALL APPLICABLE CODES
IN YOUR AREA OF OPERATION. The power supply must be adequate for your specific unit.
Make sure to verify the data plate for your machine’s specific requirements (i.e. voltage,
amperage, etc.).
6. Pressure adjustment - The pressure regulator (unloader) is located on the pump (see
diagram). It controls the pressure being generated by the pressure washer. This regulator may be
adjusted to the desired pressure by turning the adjustment knob. Turning the adjustment knob
clockwise will increase the pressure. NEVER OPERATE SYSTEM AT A HIGHER PSI
THAN THE MAXIMUM RATING. This machine has been adjusted to operate at a specific
maximum pressure as per the machine specifications. Pressure may be reduced for lighter use by
turning the Pressure Regulator/Unloader counter clockwise. If continuing to turn the unloader
clockwise does not increase the pressure, then this implies the maximum has been reached for
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Oil Fired Gas & Diesel • Rev. 4/7/2016
the system. Any further turning of the unloader will cause the pressure to spike when the wand
trigger is released, resulting in possible damage to the machine. To avoid this effect, loosen the
unloader (counter-clockwise) until the pressure just starts to drop (see pump head pressure
gauge) and until it no longer exceeds the maximum pressure rating for the machine.
7. You are now ready to start the cleaning operation - Pull trigger on the pressure wand
assembly to start cleaning. To stop the pressurized water, release the trigger. DO NOT
LEAVE UNIT RUNNING WHEN NOT IN USE.
8. To stop Burner operation – Turn BURNER switch to ‘PUMP’ (or to ‘OFF’ for Auto start
stop models) and run pump for two minutes with trigger gun pulled to allow coil to cool down.
After cooling period is complete, turn off main power to motor by turning BURNER switch to
‘OFF’ (turn PUMP switch to ‘OFF’ if equipped with auto start stop). Squeeze and release the
trigger for the second time in order to relieve the pump system of pressure.
9. Prior to storage – Inspect pressure washer for any damage or required maintenance. If your
machine is to be exposed to cold weather, please refer to winter pump/coil instructions found in
this manual. If possible, do not allow unit to remain outside in the elements.
10. Warning – If unit is left running while not in use, pump damage may occur. Do not leave
unit running while not in use!
11. Battery Specifications for electric start systems only – Rating: 165CCA, 190 CA or better,
dimensions: 8” x 5” x 6” (applies to commercial units).
CHEMICAL APPLICATION
Downstream Chemical Injection: Standard (Direct Drive Units)
High Pressure Soap (Optional Feature)
NOTE: Do not remove back flow preventer as chemical may flow back into potable water
source. For standard chemical injection, ensure the black nozzle is properly fitted at the
end of the wand. The chemical injector will not function if this nozzle is not fitted.
1. Chemical preparation – Select detergent/chemical that best suits your cleaning task. Prepare
dilution according to the manufacturer’s instructions. The volume of chemical being used may be
adjusted at valve located on the chemical injector. Note: for EK Pumps, the volume is preset and
cannot be adjusted.
2. Insert the intake hose, located on the chemical injector at the pump, into the chemical being
used.
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3. Fit black nozzle on the standard wand, or for the dual wand, turn adjustment knob on, and
adjust for required flow rate. For high pressure soap systems, the black nozzle is not needed; use
one of the other wand nozzles.
4. To apply chemical, engage trigger on pressure wand assembly. Turn chemical injector’s nipple
to adjust flow. For the high pressure soap systems, open ball valve and engage trigger.
5. Chemical can now be applied through pressure wand assembly. It will take 5 – 15 seconds for
chemical to travel to spray nozzle. The volume of chemical being used may be adjusted at the
chemical injector.
6. For best results apply chemical from bottom to top, and allow for proper penetration time prior
to rinsing. Do not allow chemical to dry. Rinse from bottom to top and then top to bottom.
WINTER PUMP/ COIL PROTECTION
The following procedure MUST be used when the pressure washing
unit is stored at temperatures below freezing.
1. All water must be drained or blown (via compressed air) from system. Connect a short piece
of male fitted ½” garden type hose on to the female inlet on the pump.
2. Place the open end of the hose into a wide mouthed container of full strength, winter rated,
vehicle windshield washing fluid or Anti-Freeze, RATED FOR MINIMUM -40°C.
3. Connect the pressure wand assembly.
4. Start the engine and engage the trigger on the pressure gun. Operate the system until the fluid
runs the same color as the windshield washing fluid. Your machine is now prepared for storage.
5. Disconnect fluid supply, blow out with compressed air, and cap end.
GENERAL MAINTENANCE
Burner Maintenance
NOTE: Repair of the burner is to be done by authorized and trained burner professionals
only.
The oil filter cartridge should be replaced every year to prevent fuel contamination and plugging
of fuel pump and nozzle of oi burner. The nozzle should also be replaced at least once every year
or twice if used daily and if poor combustion begins to occur. See the included burner manual for
more information on burner.
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Oil Fired Gas & Diesel • Rev. 4/7/2016
Final adjustments to burner include fuel pressure adjustment for controlling water temperature
(tighten fuel pressure adjustment screw slightly to increase desired output temperature) and air
band adjustment for combustion efficiency. A combustion test kit should be used for these final
adjustments. Check SPECIFICATIONS chart (page 7) for the burner oil pressure corresponding
to your model and be sure not to exceed this pressure. See included burner manual for more
information and a parts break down of the burner.
If the burner floods with oil: run machine with heat on until all excess oil is burned off (this
can take up to a couple of hours). If excess oil is not properly dealt with, the ceramic casing can
absorb excess oil, causing a fire hazard. DO NOT LEAVE MACHINE UNATTENDED WHILE
MACHINE IS FLOODED.
General Maintenance and Care
If the water heater is likely to be exposed to freezing weather then it should be winterized
according to the winter pump/coil protection procedure in the previous section. Alternate
methods may not completely protect the components. Damage from freezing is not a warrantable
item.
Water Condition
Use a softener on your water system if local water is known to be high in mineral content. The
advantages of soft water are very beneficial: prevents scale buildup in heater coil, cleans better
with considerably less detergent, prevents streaking on painted surfaces and glass when rinsing.
Descaling Heater Coil Procedure
NOTE: Descaling of the heater coil is to be done by authorized and trained burner
professionals only.
The best way to acidize the coil is with a circulation pump capable of handling acids.
1. Fill a plastic container with a suitable acid diluted with water to desired strength.
2. Connect discharge from the circulating pump to the hot water outlet on the water heater with a
suitable hose. Connect the inlet of the circulating pump to the acid container with suction hose
from the pump module and use it as a return hose to the acid container. As acid dissolves the
scale it becomes neutralized, so about every five minutes add more acid to the container until all
the scale has been removed from the coil. Flush out coil thoroughly with water after descaling.
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MAINTENANCE CHECKLIST
Maintenance for Pump
Daily
1. Check oil for proper level and adjust accordingly.
2. Examine the quality of the oil.
3. Check pump for oil and/or water leaks.
4. Inspect and clean inlet filters.
Weekly
1. Examine all fittings, components, hoses, connections, and nozzles for damages, loose
parts, or leaks. – Replace accordingly—
Recommendation for Oil Changes and Component Replacement
1. Change the oil in the pump after the first 50 hours and every 500 hours after the initial
oil change. Use SAE 30 W Non-Detergent for GP Pumps and Hydraulic 68 for EK
Pumps.
2. Change all other components on the pump as needed.
Maintenance for Gasoline Engine
Daily
1. Check oil for proper level and adjust accordingly.
2. Examine the quality of the oil
3. Examine the air cleaner element
Weekly
1. Examine engine components for damages, loose parts, or leaks.
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Recommended Schedule for Oil Changes and Component Replacements
1. Change engine oil after first 5 hours and every 100 hours after the initial oil change.
Use 10w-30 engine oil.
2. Replace Spark Plug every 100 hours.
3. Change air cleaner element every 100 hours.
4. Check fuel filters every 300 hours.
5. Change all other components on engine as needed.
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GLOSSARY OF TERMS
PSI – Pounds per square inch. Pressure washers are designed and rated to operate at a specific
PSI. Operating at pressures exceeding the maximum rating could result in damage to the unit
and/or SEVERE PERSONAL INJURY.
GPM – Gallons per minute. The orifice on the pressure wand assembly has been selected to
deliver up to the maximum GPM for your machine.
PRESSURE WAND ASSEMBLY – This refers to the gun, wand, and nozzle.
PUMP – The pump moves the water through the system and delivers it to the pressure wand
assembly.
UNLOADER VALVE – Is a valve located at the head of the pump for unloading water back
into the bypass when the trigger gun is shut off. It also reduces the load on pump when gun is
off.
OIL, PUMP – The oil used within the pump to lubricate its operation. Important to use only
SAE 30 W Non Detergent (GP Pump) or Hydraulic 68 (EK Pump) in the pump (see diagram).
OIL, GASOLINE ENGINE – Gasoline Engines need appropriate lubricant. Use 10W30
detergent oil.
BURNER – The burner heats the water in hot water pressure washers. It is located under the coil
and may be powered by furnace oil or diesel fuel.
BACK FLOW PREVENTER – Device to prevent flow backwards into potable water supply.
MAXIMUM WORKING PRESSURE The water heater coils are designed to operate safely at
normal working pressure. Each machine is equipped with a safety pressure relief valve which
prevents over pressurization of the high pressure system. It is an important safety device and
must not be tampered with in any way.
TEMPERATURE CONTROL- The water heater is equipped with a temperature control which
shuts down the burner in the event of excessive outlet temperature caused by insufficient water
flow through the heater coil. Do not set thermostat above 195°F
PRESSURE SWITCH - A high pressure switch is used to control the burner. It is part of the
burner control system (see diagram).
FLOW SWITCH – A flow switch is installed on the outlet of the high pressure pump and will
shut off the pump and motor in the absence of water flow as well as turning it back on when flow
is detected (by squeezing the trigger).
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Oil Fired Gas & Diesel • Rev. 4/7/2016
COMPONENT IDENTIFICATION
Commercial Model:
10 Gallon Poly Fuel Tank
Burner Switch and
Thermostat
Gasoline Engine
Coil Skin
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Oil Fired Gas & Diesel • Rev. 4/7/2016
Direct Driven Pump Assembly:
Chemical
Injector
Water Inlet
Unloader
Burner Control
Pressure Switch
Safety Relief Valve
Temperature
probe
Hot Water Outlet
Quick Connector
Water Pump
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